Luke 1:8
Once when Zechariah's division was on duty and he was serving as priest before God — the temple service context is important: Zechariah is performing his priestly rotation in Jerusalem, the center of the covenant community's worship. The priestly divisions served twice a year for a week at a time; within that week individual duties were assigned by lot. The divine appointment is about to come to Zechariah in the midst of his faithful performance of his ordinary priestly duties.